1. We recognize a state of equilibrium when A. the reaction goes to completion B. all molecular motion stops C. there is no further change in any macroscopic property D. the reaction goes halfway to completion E. the system alternates between reactants and products in a periodic fashion 2. 2CO 2 (g) ← 2CO(g) + O 2 (g) K c = 2.0 x 10-7 → If 2.0 mol of CO 2 is placed in a 5.0 Liter container, and decomposes according to the above equation, calculate the concentration of O 2 at equilibrium. A.

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